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Angles on CP-violation in Higgs boson interactions

Bernlochner, Florian U.; Englert, Christoph; Hays, Chris; Lohwasser, Kristin; Mildner, Hannes; Pilkington, Andrew; Price, Darren D.; Spannowsky, Michael

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Florian U. Bernlochner

Christoph Englert

Chris Hays

Kristin Lohwasser

Hannes Mildner

Andrew Pilkington

Darren D. Price


CP-violation in the Higgs sector remains a possible source of the baryon asymmetry of the universe. Recent differential measurements of signed angular distributions in Higgs boson production provide a general experimental probe of the CP structure of Higgs boson interactions. We interpret these measurements using the Standard Model Effective Field Theory and show that they do not distinguish the various CP-violating operators that couple the Higgs and gauge fields. However, the constraints can be sharpened by measuring additional CP-sensitive observables and exploiting phase-space-dependent effects. Using these observables, we demonstrate that perturbatively meaningful constraints on CP-violating operators can be obtained at the LHC with luminosities of (100/fb). Our results provide a roadmap to a global Higgs boson coupling analysis that includes CP-violating effects.


Bernlochner, F. U., Englert, C., Hays, C., Lohwasser, K., Mildner, H., Pilkington, A., …Spannowsky, M. (2019). Angles on CP-violation in Higgs boson interactions. Physics Letters B, 790, 372-379.

Journal Article Type Article
Acceptance Date Jan 21, 2019
Online Publication Date Jan 28, 2019
Publication Date Jan 28, 2019
Deposit Date Jan 31, 2019
Publicly Available Date Feb 13, 2019
Journal Physics Letters B
Print ISSN 0370-2693
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 790
Pages 372-379


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